The average battery lifetime of Polar T31 and T31C Transmitter is 2500 hours of use.

When the battery dies, you will need to replace the whole heart rate sensor (structure of the transmitter is sealed). Find nearest Polar retailer from Polar Service Finder.

With good care your T31/T31C Transmitter will last longer. Washing the heart rate sensor regularly and never storing it wet ensures reliable measurement and maximizes its life span. See here for detailed care and maintenance instructions.

Do not dispose of this product as unsorted municipal waste. To minimize possible effects of waste on the environment, please follow local waste disposal regulations and, where possible, utilize separate collection of electronic devices.